The adult retailer launched the online striptease to promote its range of Rabbit vibrators.
It features a Brazilian stripper called Roberto, dressed as a US Marine, who strips to his underwear while dancing to cheesy music.
Visitors to the site were offered a 10% discount on all Rabbit vibrators, which Ann Summers said may have contributed to the large number of people attempting to enter its site.
An Ann Summers spokesman said: "It's unfortunate that the site's server crashed. We found it hard to keep up with the sheer volume of people visiting."